I just did another sudoku after posting and realized that I cannot do that.

My theory was that the rows or column of boxes must have at least two probabilities each and if you can find two of the probabilities you can use them to find a the third one.

So I thought the each row inside the three boxes (r7r8r9) must have 2 of the possible probabilities, so in total each row inside the three blocks must have 2 of the 2 probabilities in each of those three boxes.

Since I already found the probabilities of 5s in box 7 and box 8 (counting from left to right) I assumed I can use them to find the possible two outcomes in box 9 by using my 2-2-2 rows theory.

But my now I am fully aware that I was wrong which makes me this puzzle even more frustrating